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D( v )
v = 0
v = 0
v = 0
v in (-oo:0) U (0:+oo)
5/7 = 6/v // - 6/v
5/7-(6/v) = 0
5/7-6*v^-1 = 0
-6*v^-1 = -5/7 // : -6
v^-1 = 5/42
-1 < 0
1/(v^1) = 5/42 // * v^1
1 = 5/42*v^1 // : 5/42
42/5 = v^1
v = 42/5
v = 42/5
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